racketboy has a great roundup of NES console options. These include Nintendo Entertainment System work-alikes. You should be able to plug most of your old 8-bit game cartridges right into one of these and be up and running right away:

I received a friendly email the other day asking what NES clone I would recommend. While I have talked about all of the major players in the past, I haven’t actually owned any myself, nor had I done enough research to give a reliable answer. Also, I thought it would be nice if I produced a detailed article to present to him and share with future shoppers instead of a quick response. Below, you will find the results of my research of both NES clones and Nintendo’s two official console releases. I’ve tried to summarize all my findings in an easy to digest manner and everything is pulled from a variety of reviews and conversations about each machine. If you would like to add your own experiences, feel free to use the comments section below.